Ballpoint pen



FIG. 1 is a perspective view of the ballpoint pen according to the present invention;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a first end view thereof;

FIG. 5 is a second end view thereof;

FIG. 6 is a first side view thereof; and,

FIG. 7 is a second side view thereof.

The portions shown in broken lines in the drawing figures show environmental structure only, and form no part of the claimed design. 

The ornamental design for a ballpoint pen, as shown and described. 